Photo: Wikimedia Commons (CC BY-SA)
동대문구정보화도서관
Library · Dongdaemun-gu
Public library in Dongdaemun-gu. Free entry and reading, with heating and air conditioning.
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Source: www.l4d.or.kr
Dongdaemun Youth Center
₩4,500Sports facility · Cheongnyangni Stn. (Line 1, Suin-Bundang Line, Gyeongui-Jungang Line, Gyeongchun Line)
Public indoor pool with open swim sessions.
King Sejong the Great Memorial Hall
₩3,000Museum · Korea Univ. Stn. (Line 6)
Established in 1970 by the King Sejong Memorial Society to honour and preserve the virtue and achievements of King Sejong the Great.
Hongneung Forest
FreePark · Cheongnyangni Stn. (Line 1, Gyeongui-Jungang Line)
Korea's first arboretum. A lush, free forest trail with 100 years of history, best walked in spring and autumn.
Seoul Youth Center Dongdaemun
FreeStudy & youth space · Hoegi Stn. (Line 1, Gyeongui-Jungang Line)
A lounge, study and community space free for all young people, part of the Seoul Youth Center Orang network.
Kyung Hee University Museum of Korean Medicine History
FreeMuseum · Hoegi Stn. (Line 1, Gyeongui-Jungang Line)
The museum displays materials tracing the history of Korean medicine, helping students of the field deepen their specialist knowledge.
Kyung Hee University Central Museum
FreeMuseum · Hoegi Stn. (Line 1, Gyeongui-Jungang Line)
Since opening in 1955, the museum has centered on archaeology, history and folklore.

Seoul Metropolitan Library
FreeJung-gu · City Hall Stn. (Lines 1, 2)
A landmark right in front of Seoul Plaza. Known for its stepped bookshelves and glass-walled plaza views, with a rooftop and cafe for a break.
Starfield Library
FreeGangnam-gu · Samseong Stn. (Line 2), Bongeunsa Stn. (Line 9)
Famous for its 13m-high shelves, this is a photo hotspot inside COEX Mall. Ideal escape from summer heat and winter cold, with plenty of seating.
Jeongdok Public Library
FreeJongno-gu · Anguk Stn. (Line 3)
A campus-style library on the Bukchon hillside. A healing spot where you can picnic on garden benches among spring cherry blossoms and autumn leaves.

Namsan Library
FreeYongsan-gu · Myeongdong Stn. / Hoehyeon Stn. (Line 4)
A library atop a stairway on the slopes of Namsan. Read a book, then walk straight on to Namsan Park and N Seoul Tower on a free route.
Jongno Library
FreeJongno-gu · Gyeongbokgung Stn. (Line 3)
On the edge of Sajik Park and Inwangsan. Read, then stroll the park; pair it with Gyeongbokgung for a full day.